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ventilation

Passive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural forces.
There are two types of natural ventilation occurring in buildings: wind driven ventilation and buoyancy-driven ventilation. Wind driven ventilation arises from the different pressures created by wind around a building or structure, and openings being formed on the perimeter which then permit flow through the building. Buoyancy-driven ventilation occurs as a result of the directional buoyancy force that results from temperature differences between the interior and exterior.Since the internal heat gains which create temperature differences between the interior and exterior are created by natural processes, including the heat from people, and wind effects are variable, naturally ventilated buildings are sometimes called "breathing buildings".

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  1. H

    URGENT Gas Cooker Ventilation Requirements

    Hello, I have recently had a conservatory installed, covering the full length of the kitchen. I have just failed my gas safety inspection due to lack of ventilation. I have a ventless extractor fan, thinking that would do that job… but apparently not. Is there any other solutions to it? and why...
  2. S

    Boiler air intake ventilation

    I have a Remeha Tzerra M 24c Plus boiler. It is sitting nice and tight, next to the central ventilation unit/pipeline of the apartment block. That central unit is rather big, I assume around 50cmx50cm and at least 20m tall. So the exhaust ventilation pipe of the boiler goes directly out to this...
  3. S

    Commercial gas meter compartment ventilation

    Can someone point me in the direction of where to purchase high and low level vents for a compartment housing a commercial gas meter. It's a U16/ 21mb outlet in a commercial premises. I've researched the regs and vent needs to be fire resistant, weather proof, vent size no smaller than 10mm etc...
  4. D

    Boiler Room Ventilation

    Hi All, I'm looking for a little advise regarding natural ventilation to a boiler room. The boiler room is in a basement, that you access externally. you walk down a set of stairs into a small lobby and then into the boiler room. My question is, will I comply with regs if I have a fully...
  5. F

    slow flushing toilet - is it the vent?

    Hi all! Hoping to get some advice: We have a slow flushing toilet that I've tried plunging, snaking and chemicals to get going but all of that made no difference. I noticed that if I detached the U-bend from the sink that goes to the same drain the toilet flushed perfectly - this led me to...
  6. T

    Electric Heating - Condensation, ventilation.

    Small 47 sq meter 2nd floor flat in London - 50 flat block Built 1998. All electric , no gas possible. 2 x 20 yr old original Creda storage heaters - lounge and bedroom - both have windows. The flat possibly wont be occupied 2-4 weeks in some months during the year. Because of this will...
  7. A

    CP12 Gas Safe Cert & Lodger & Hob Ventilation Requirements

    Hi everyone I would be grateful for some advice from someone with Gas Safe Certification please I have a kitchen around 7m square (so above the 5m rule but below the 10m rule) I have a modern condensing boiler room sealed. I have a gas hob with mechanical extractor hood above with extractor...
  8. T

    Can I box a back boiler/gas fire into a cupboard?

    Hello I've had a google around but haven't found anything that suits my situation. I have an old back boiler (complete with a typical lovely eyesore 80's gas fire) in the chimney breast in my kitchen that used to be a dining room. The gas fire part of it is never used. Obviously it's massively...
  9. K

    Is ventilation required for a meter cupboard ?

    Is ventilation required for a gas meter cupboard ?
  10. K

    DFE ventilation requirements

    Quick question about ventilation for gas fires with cavity wall insulation We would like to get cavity wall insulation, we chose a CIGA registered installer and have been told we need a vent in our lounge as we have a fire. I have looked at the "CIGA flues, chimneys and combustion air...
  11. R

    Boiler Cupboard

    Hi I have a logic plus combo boiler C35 and I'm going to be building a plasterboard cupboard around it..does need minimum clearances around it? and some form of ventilation e.g louvres vents? Ive look in my manual but cant see to find any info All advice appreciated Thanks
  12. C

    Ideal E Type Boiler Ventilation Requirements

    Hello All I've just joined this forum after googling its results for years - very helpful thankyou. I have an extremely old ideal e type boiler CF105N that works like a trogan. It is in an internal boiler room with no external walls with a flue exiting through a chimney to the outside...
  13. L

    Ventilation

    Hi Im currently on my ACS training course. I was wondering if anyone had an easier way of working out ventilation, other than the huge formulas or an app? Thanks
  14. B

    back boiler ventilation

    vent is in floor don't think its ducted Is it AR to be honest its going to be difficult to explain to this old boy why he has had it serviced year after year and no one has mentioned the vent being an issue so if its not AR I will let it pass
  15. L

    Multi appliance ventilation

    Hi was wondering if anyone could help me, I was at job today and there are two of the exact same fires in living room and dining room that has been made into one room as the wall has been knocked down to make it one big room. Both fires are under 7 kw, both have passed safety checks. I have...
  16. M

    Does anyone know about insulating lofts / condensation / ventilation issues?

    Not really a plumbing question but there are some very knowledgeable chaps on here so... My roof is tiles on close-boarded timber planks (sarking board I think?) and as far as I can tell, no felt or breathable / waterproof membrane. I want to insulate and board the roof to make the loft warmer...
  17. jaydebruyne

    DFE Ventilation

    I know this has prob been discussed but I can't find the thread. So my boss calls me today and says: "Jay, I'm at blah blah property, you turned off a DFE as there was no vent?" "Oh yeah" I say. "How'd you work that one out, it's only 6kW?" "All DFE's need a 100cm2 vent even if under 7kW" I...
  18. M

    Pipe condensation, to insulate or not?

    Within my house, the section of pipe coming off my internal stopcock is suffering badly with condensation. It's in a downstairs extension and is run in a 4 inch deep channel cut into concrete flooring.it wss suffering with severe corrosion and has just been swapped to 15mm plastic pipe. We...
  19. I

    Magiglo Solitaire 2 16 inch gas fire

    Hi there please has anyone got a copy of the manual for the above fire. i be live it was manufactured by Magiglo prior to them being taken over, around 2001. kind regards. Ian
  20. jaydebruyne

    DFE Ventilation

    I know DFEs under 20kW have 100cm2 vents, if a DFE is 25kW, would you just put in another 135cm2 vent as you would with 2 DFEs? Had a fire today that I had to cap off as the flame was about a foot and a half high and coming through the fire guard and no ventilation - it also had no gas valve...
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